Welt turning mechanism in straight bar knitting machines



2,428,514 HINES,

7 M l 7 in 0 Filed April 18, 1946 7 Sheets- Sheet 1 SGxk mmawa M Oct. 7, 1947. w. COOPER EI'AL WELT TURNING MECHANISM IN STRAIGHT BAR KNITTING MAC HINES Filed April 18, 1946 TSheets-Sheet 2 Alto/weal Oct. 7, 1947.

Filed April 18, 1946 7 Sheets-Sheet 3 HINES Oct. 7, 1947. w. A. COOPER ET AL WELT TURNING MECHANISM IN STRAIGHT BAR KNITTING MAC Filed April 18, 1946 7 Sheets-Sheet 4 g hventom y AM 2,428,514 SM 1N STRAIGHT BAP. KNITTING MACHINES Oct. 7, 1947. w. A. COOPER EFIAL WELT I TURNING MECHANI Filed April 18, 1946 7 Sheets-Sheet 5 W. A. COOPER E AL Oct. 7, I947.

Filed April 1.8, 1946 7.Sheets-Sheet e F/GS Mme/Mom W. A. COOPER ET AL WELT TURNING MECHANISM IN STRAIGHT BAR KNITTING MAC HINES Filed April 18, 1946 '7 Sheets Sheet 7 k F/GB 2 Q lave/5524 612% 99mm, a, ha-2e Attorney Patented Oct. 7, 1947 WELT. TURNING MECHANISM 1N STRAIGHT BAR KNITTING MACHINES William Arthur Cooper and William Gordon Macdonald, Loughborough, England; assignors to William Cotton Limited, Loughborough, England Application April 18, 1946,SerialNo. 663,114 In GreatBritain-January 6, 1945 Section LPublioLaw 690, August 8, 1946; 5 Claims. 66-96 This-invention comprises improvements in and Figure 3is an endview thereof, partly in secrelating to welt turning mechanism of Cottons tion; patent and other straight bar knitting machines, Figures 4 and 5 show portions of the mechaanism of the kind wherein welting instruments Figure 7 is a. section on a still larger scale (or welt hooks) are inserted from the plain side through the head thereof, while of the needles to receive thread or thread kinks Figures 8-12 inclusive are diagrams illustrating of an initial Welt course, areretracted from the 10 the operation of said-instruments. needles during the knitting of at. least a, por- The said construction is described as an'examtion of the welt, are subsequently advanced to ple of'the application of the invention to a weltfrom th transfix d emu-5e by t a ti and 537,368 (to which reference is to be made) Mechanism of this kind is described in British l d having a Welt o f r eve y needle spa e. patent specifications 0s. 5481374; 537,336 and Figures 1a and 1b Show e ant parts of 537,368, the machine, including needle bar I with bearded hooks to, and main cam shaft i l carrying cams portions to miss all the loops in their retractive th derived from slur-cock l7 and catch bar l8, both operated in known manner. The knock-over bar amsm of the kmd Feferred characterised by 28 is supported on rock shaft'Zl which is rocked;

by truck lever 22, and cam 2-1. Shaft 2| is supm l of .the'sehfedges and means ported by arms 23'from shaft ZQ-Which is rocked b truck lever 25 and cam 26. instruments to facilitate the retraction of the yAssociated with every second needle there is latter from the transfixed initial course. These 40 an auxiliary Dresser H which Dressers are mount supports may be constltuted by instruments that ed below the knocking over bits 6 and extend up register P and move upwards with the needles between them. They are carried by bar 20 which and the Sald support Instruments may also is mounted on the front of the knock-over bar tion to deflect spaced needles out of alignment 2 u are capable f up and down movement to ensure an emcient transferindependently of the latter. For this purpose T e foregoing d other features of the the bar 20 1s shdably mounted at 29 and is drawn vention set out in the appended claims, are mdownwards by sprlngs 3g F g 2, belng ralsed by draw s in h 32 is movable by" the mechanism shown in Figs. gures 1a and 1b show a cross section through 4 and 5, from a. cam as on the main cam shaft I l the knitting machines showing the relevant parts operating a truck-lever 35. The latter is conthereof; nected to a vertically movable cam slide 36 by a Figure 2 is an elevation of the knocking-over connecting rod 31 and hinged joints 38, 39 and bar and associated parts; I the cam slide has two parallel, inclined faces 36a tial welt course, which loop or and extends across a pair of which are received between like faces 32d on bar 32. Therefore, when the cam slide is lowered from its Fig. 5 position, bar 32 is forced to the left and when it is raised again the bar is forced to the right.

At the commencement of the welt the pressers H! are operated to press ofi every second needle instead of the points 2| of the said specification so that (there being a needle space) between every other needle the kink pressed off from the intervening needle extends over two welt hooks; he finish of the welt they are operated to deflect every second each said second needle rises it will penetrate with more certainty a pressed off from it welt hooks l0.

As shown in Figs. 6, each of these flat head 19a, to pass having its straight front pressers l9 up between edgeformed the needle associated with pressers of the beard, and at the selvedge are cut back from said edge at the top head to form support shoulders l9c.

Turning now to Figs 8-12, Fig. 8 illustrates the phase in the welt-turning operations whereat the welt fabric F has been knitted and is pulled by the inserted welt rods or wires (not shown) in a bight beneath the welt bar so that the initial kinks are supported on the elevated ledges of the welt instruments It) as described in the specifications referred to.

In the operation of restoring the initial course to the needles 2 the welt bar 8 advances and the welt hooks l are inserted horizontally below the sinkers 5 the knocking-over bits 6 while the needles 2 and auxiliary pressers it are lowered, Fig. 9. The latter then move forward (Fig. to press the beard of every second needle 2 and to deflect said needles out of alignment with the other needles. Needles 2 an pressers l9 then rise together (Figs. 10 and 11) so that the deflected needles enter the thread kinks held over the support ledges ofthe welt hooks l0 and said thread kinks lodge on the support shou1ders I90 of the pressers. This movement carries the thread kinks Well up into the sinkers 5 and permits hooks to be disengaged by a sharp retiring movement (Fig. 12) the needles 2 continue to ascendand the pressers M are lowered.

Thus the initial been restored to the needles so that'the next course is drawn through the initial course and the latter is thereby secured.

We claim:

1. In a Cottons patent or other knitting machine having welt-turning mechanism wherein welting instruments, one for each needle space, are inserted from the plain side of straight bar In for every 7 mencement of the welt, to

' lift the transfixed kinks for the retraction the needles to receive thread kinks of an initial welt course cast 0 every second needle, are retracted from the needles during the knitting of at least a portion of the welt, are subsequently advanced to offer the initial welt course kinks held by them to be transfixed'by every second needle in rising, disengaged from the transfixed course by retraction, the combinaauxiliary 7 for operating said pressers at the compress every second tion of an dle, means needle 'to cast off its thread welt course, means for operating them at the termination of the welt to deflect each second needle towards the plain side of the needle line the kinksofiered by the welting inand means for raising said pressers to therefrom of the welting instruments.

2. Mechanism according to claim 1, wherein each auxiliary presser'has a ledge for supporting the thread kink and a groove for receiving the. needle beard.' V

3. In a straight bar knitting machine having welt turning mechanism of the kind wherein welting instruments, one for eachneedle space, are inserted from the the needles to receive thread kinks of an initial welt course cast- 7 off from spaced needles, are retracted from the needles during the knitting of at least a portion of the welt, are subsequently advanced to offer the initial transfixed then disengaged from the transfixed course by retraction; the combination of supports for engaging kinks of the initial welt course at in the neighborhood of the selvedge, and means for lifting said supports in relationto the welting instruments to facilitate the retraction of the later from the transfixed kinks. V

4. Mechanism according .to claim 3 being of the kind wherein, at the commencement of the welt, kinks of the initial course are pressed off or cast ofi spaced needles and are returned to said spaced needles at the welt, having a support for each of said spaced needles.

5. Mechanism 7 support for each of spaced needles for'operating said supports to press spaced needles at the commencement of the welt in casting off thread kinks of the initial welt course from said spaced needles.

WILLIAM ARTHUR COOPER. WILLIAM GORDON MACDONAILJ). '1 v 7 REFERENCES crrnn V f I The following references are of record in the; file of this patent: I

UNITED STATES PATENTS Number Name Date r 2,305,335 Wilders et al. Dec. l5,l942 7 V kink of the initial least 

